#!/usr/bin/bash
#
# abi-check [-u] <package-name> <version> [...]
#
# Build ABI dumps for all listed versions. If exactly two are given,
# build an ABI compatibility report for them, and if -u is given,
# upload it to the website.
#

# Top-level rsync destination for www targets (without trailing slash)
: ${RSYNC_DEST:=root@www.clusterlabs.org:/var/www/html}

# If the argument is of form x.y.z, print Pacemaker-x.y.z,
# otherwise print the argument (presumably a commit ID) directly
tag() {
    if [[ "$1" =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3} ]]; then
        echo "Pacemaker-$1"
    else
        echo "$1"
    fi
}

# Strip anything up to and including a dash from the argument
version() {
    echo "$1" | sed s:.*-::
}

# Create configuration file for ABI dumper
abi_config() {
    PACKAGE="$1"
    VERSION="$2"
    BUILD_ROOT="$3"
    DESC="$4"

    # Create header
    DESC="$BUILD_ROOT/$VERSION.xml"
    cat <<EOF > "$DESC"
<?xml version="1.0" encoding="utf-8"?>
<descriptor>
<version>
    $VERSION
</version>
<headers>
        $BUILD_ROOT/root/usr/include/$PACKAGE/crm
</headers>
<libs>
EOF

    # Build checkout, installing into subdirectory
    ( cd "$BUILD_ROOT" && ./autogen.sh && ./configure --disable-fatal-warnings )
    make -C "$BUILD_ROOT" V=0 DESTDIR="${BUILD_ROOT}/root" install
    if [ $? -ne 0 ]; then
        echo "Build for $TAG failed. Repair, populate <libs/> and re-run: "
        echo "  abi-compliance-checker -l $PACKAGE -dump_abi $DESC"
        echo ""
        echo "To find libraries after building:"
        echo "  find $BUILD_ROOT/root -name "*.so" -print"
        exit 1
    fi

    # Add library names to configuration file
    find $BUILD_ROOT/root -name "*.so" -print >> $DESC

    # Add footer
    cat <<EOF >> "$DESC"
</libs>
</descriptor>
EOF
}

# Dump the ABI for a particular version
extract_one() {
    TAG="$1"
    VERSION="$2"

    # If dump already exists, remove it if dumping HEAD (which changes),
    # otherwise use it (a dump for a particular commit stays the same).
    TARBALL="abi_dumps/$PACKAGE/${PACKAGE}_$VERSION.abi.tar.gz"
    if [ "$VERSION" = HEAD ]; then
        rm -rf "$TARBALL"
    elif [ -f "$TARBALL" ]; then
        return
    fi

    echo "Building ABI dump for $*"

    # Get a clean checkout at the desired commit
    BUILD_ROOT=".ABI-build"
    rm -rf "$BUILD_ROOT"
    ( cd .. ; git archive --prefix "doc/$BUILD_ROOT/" "$TAG" | tar xv )
    if [ $? -ne 0 ]; then
        exit
    fi

    # Remove "doc" from SUBDIRS in Makefile (but why?)
    BUILD_ROOT="$(pwd)/$BUILD_ROOT"
    sed -i.sed 's: doc::' "$BUILD_ROOT/Makefile.am"

    # Run ABI dump
    abi_config "$PACKAGE" "$VERSION" "$BUILD_ROOT" "$DESC"
    abi-compliance-checker -l "$PACKAGE" -dump_abi "$DESC" \
        -dump-path "abi_dumps/${PACKAGE}/${PACKAGE}_${VERSION}.abi.tar.gz"

    # Clean up
    rm -rf "$BUILD_ROOT"
}

extract_all() {
    for arg in $*; do
        T=$(tag "$arg")
        V=$(version "$T")
        extract_one "$T" "$V"
    done
}

UPLOAD=0
if [ "$1" = "-u" ]; then
    UPLOAD=1; shift
fi

PACKAGE="$1"; shift

extract_all "$@"

if [ $# -eq 2 ]; then
    V1=$(version "$1")
    V2=$(version "$2")

    abi-compliance-checker -l ${PACKAGE} \
        -d1 abi_dumps/${PACKAGE}/${PACKAGE}_${V1}.abi.tar.gz \
        -d2 abi_dumps/${PACKAGE}/${PACKAGE}_${V2}.abi.tar.gz
    if [ $? -ne 0 ]; then
        exit $?
    fi

    COMPAT_REPORT="compat_reports/${PACKAGE}/${V1}_to_${V2}"
    if [ $UPLOAD -eq 1 ] && [ -d "$COMPAT_REPORT" ]; then
        rsync -azxlSD --progress "$COMPAT_REPORT" "${RSYNC_DEST}/${PACKAGE}/abi/"
    fi
fi
